A virtual private network is used to connect one device to another device through a public network such as the Internet

A company wants to prevent unauthorized access to its secure data center. Which of the following security controls would be MOST appropriate?

A. Alarm to local police B. Camera C. Security guard D. Motion detector

Analyze the following code:

``` public class Test { public static void main(String[] args) { A a = new A(); a.print(); } } class A { String s; A(String s) { this.s = s; } void print() { System.out.println(s); } }``` a. The program has a compile error because class A is not a public class. b. The program has a compile error because class A does not have a default constructor. c. The program compiles and runs fine and prints nothing. d. The program would compile and run if you change A a = new A() to A a = new A("5").